In the US people working the tills are usually TOO nice and you don't want to make smalltalk with them. Only in NYC have I encountered rude till people, and even there, most are pretty pleasant.
Yes in the US honestly I feel anxiety thinking about the cashier being too nice and not responding appropriately friendly enough haha, there is such a pressure for good service for any retail worker that I feel like it's somewhat rare for them to be straight up 'rude', at most they will be quiet. Like you mention though it does vary a lot region to region from what I've seen.
In the US people working the tills are usually TOO nice and you don't want to make smalltalk with them. Only in NYC have I encountered rude till people, and even there, most are pretty pleasant.
Yes in the US honestly I feel anxiety thinking about the cashier being too nice and not responding appropriately friendly enough haha, there is such a pressure for good service for any retail worker that I feel like it's somewhat rare for them to be straight up 'rude', at most they will be quiet. Like you mention though it does vary a lot region to region from what I've seen.